Malicious PDF — malware analysis report

Static analysis result for SHA-256 3439d11bb090b487…

MALICIOUS

PDF

70.5 KB Created: 2021-03-22 08:37:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8dd4bc7bf0c4c13ae3aa913ca5c6ca5 SHA-1: 223ae5fae16c188edc5685eb0b784149b519dc5d SHA-256: 3439d11bb090b4872fd8f795a082a05638b11f6dbaad408ce1cb81b7fad00000
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many of which are SEO-optimized and point to potentially malicious or phishing content. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a link farm, and the ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests malicious intent. The primary IOC is the initial URL which appears to be a gateway for further malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://soxebez.ru/wix?keyword=halo+3+annual+achievement+guide
    • https://vijativu.weebly.com/uploads/1/3/4/5/134597759/javazefijijar.pdf
    • http://jogubewuzamofet.iblogger.org/5598116082.pdf
    • https://kujepilam.weebly.com/uploads/1/3/5/3/135343620/zedageresogejar.pdf
    • http://numelulor.iblogger.org/javor.pdf
    • https://popetebebulexu.weebly.com/uploads/1/3/4/3/134316921/37f797d9d7.pdf
    • https://sawisede.weebly.com/uploads/1/3/2/6/132681865/sovuw-kevuxifolowe-dunot.pdf
    • https://kerejokav.weebly.com/uploads/1/3/1/6/131637695/7140041.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5398b0d5-da1d-4331-8357-2ab6edcc1f2f/ap_english_language_and_composition_exam_2016_multiple_choice.pdf
    • http://lavavoju.rf.gd/direct_and_indirect_object_spanish_worksheet.pdf
    • https://uploads.strikinglycdn.com/files/2afe139e-4d57-43f6-a556-655d76faaaf8/48306309240.pdf
    • https://uploads.strikinglycdn.com/files/2f3ed724-0c20-47dd-8587-ec3b89bc5fae/how_to_use_karcher_pressure_washer_detergent.pdf
    • https://4c80ca50-31de-4e6f-b265-471620011c4a.filesusr.com/ugd/08c6b7_874bd03e360c40e2aa4b4f8cd3c2c491.pdf?index=true
    • https://6a1e2a5f-c456-4288-b9d5-5378f87870fb.filesusr.com/ugd/076fac_e03161e0ae914ce5ae6d3573dacecefa.pdf?index=true
    • https://47c0d0ed-94e3-447f-940a-e265262d053f.filesusr.com/ugd/a43ec6_26554c29eaf443419a46f1543420612f.pdf?index=true
    • https://12350a4d-732a-4148-85a7-4fa27f2a77ec.filesusr.com/ugd/17beed_c4b3c8b38a5540e8b0d5d12f56989103.pdf?index=true
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_19a651cc8a6247df9ab7419f34ba47d5.pdf?index=true
    • http://fejaguxalizibej.epizy.com/icharger_308_duo_vs_406_duo.pdf
    • http://misugivunuzu.epizy.com/printable_coordinate_plane_mystery_picture_worksheets.pdf
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_b7ffd048dc1544688c078046ee863515.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d660.bin
fc4d02a223c8a88fb1c637dcb249296656ba83c9e308effe853319a1847a6f1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD660 5264 bytes
font_01_sfnt_off0000e828.bin
79d2193041c1c2eb98acf5d17ce652e4cde5fc3ccc375e3755252b70ea31a19a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 10640 bytes

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